Laserfiche WebLink
Californianegional Water Quality Conl Board - : <br /> Central Valley Region i <br /> Karl E. Longley,ScD,P.E.,Chair �'�r <br /> Linda S.Adams <br /> Secretaryfor 11020 Sun Center Drive#200,Rancho Cordova,California 956706114 Arnold <br /> Environmental Phone(916)464-3291 •FAX(916)4644645 Schwarzenegger <br /> Protection http://www.waterbouds.ca.gov/centralvalley Governor <br /> 18 September 2008 <br /> Mr. Jeff Baker SEP 1 9 2008 <br /> Tesoro Companies, Inc. piVIRONMBI HEARIA <br /> 3450 South 344" Way, Suite 100 pER. MIT/SERVICES <br /> Auburn, WA 98001-5931 <br /> SECOND QUARTER 2008 MONITORING REPORT AND SCHEDULE OF WELL <br /> INSTALLATIONS, DESTRUCTIONS, AND RELOCATIONS, STOCKTON TERMINALS <br /> TECHNICAL COMMITTEE FACILITIES, PORT OF STOCKTON, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Regional Water Board) staff <br /> reviewed the 1 August 2008 Second Quarter 2008 Quarterly Site Status, Groundwater Monitoring <br /> and Remedial Summary Report (Second QMR) and the 27 August 2008 Schedule of Well <br /> Installations, Destructions, and Relocations (Schedule). Stantec Consulting Corporation <br /> (Stantec) submitted these documents on behalf of the Stockton Terminals Technical Committee <br /> (STTC). STTC is comprised of three bulk fuel facilities at the Port of Stockton (Site) including <br /> British Petroleum (BP) (formerly ARCO), Tesoro Petroleum Company Inc. (Tesoro), and Time Oil <br /> Company. <br /> The principal contaminants of concern (CDCs) at the Site include total petroleum hydrocarbons <br /> as gasoline (TPHg), TPH as diesel (TPHd), benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX), tertiary amyl methyl ether (TAME), methyl tertiary butyl ether (MTBE), and tertiary butyl <br /> alcohol (TBA). Since 20 September 2002, the STTC has utilized SoakeaseTM separate phase <br /> hydrocarbon (SPH) removal socks in select wells to remove SPH. In the fall of 2004, the STTC <br /> began operation of two ozone sparge (OS) systems to clean up groundwater pollution migrating <br /> downgradient from the Site. The system is comprised of 57 A zone and 16 B zone wells <br /> connected to two 5 pounds-per-day (lbs/day) ozone generators. <br /> The STTC conducts monitoring at the Site pursuant to Monitoring and Reporting Program (MRP) <br /> No. R5-2004-0823. Stantec conducted groundwater monitoring for the second quarter of 2008 <br /> between 5 and 9 May 2008. Sediments underlying the Site are subdivided into four progressively <br /> deeper hydrostratigraphic units referred to as the A Zone, B Zone, C Zone, and D Zone. During <br /> the second quarter, Stantec calculated that groundwater flow direction in the four zones was <br /> generally toward the southeast. Last fall, Stantec stated that elevations at wells PS/WC-1 S, <br /> PS/WC-1 M, SP/WC-1S and SP/WC-1M would be resurveyed to resolve irregularities in the A <br /> and B zone gradient calculations. The Second QMR states that negotiations for performing the <br /> resurveying are in progress. The historically predominantly downward vertical gradients between <br /> the four hydrostratigraphic units were consistently downward during the second quarter. <br /> The Second QMR reports that SPH or SPH sheen was observed in six A zone wells, including <br /> four at Time Oil and two at Tesoro. Consistent with historical observations, no B, C, or D zone <br /> California Environmental Protection Agency <br /> Co Recycled Paper <br />